Air-compressing pump.



S. DAHLBERG.

AIR OOMPRESSING PUMP. APPLICATION FILED JUNE 1, 1908.

904,940. Patented Nov. 24, 1908.

WITNESSES;- 11v VENTOR,

Jam 2102 Zia/y M BY g2 Q ATTORNEY.

SVEN DAHLBERG, OF SPRINGFIELD, MASSACHUSETTS.

AIR-COMPRESBING PUMP.

Specification of Letters Patent.

Patented Nov. a, 1908.

Application filed June 1, 1908. Serial No. 135,921.

To all whom it may concern:

Be it known that I, SvEN DAHLBERG, a Swedish subject, and resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Air-Compressing Pum s, of which the following is a full, clear, an exact description.

The obj ect of this invention is to provide a new and im roved air-compressing pump, especially available for the inflation of pneumatic tires for the wheels of automobiles, bicycles and other vehicles, and susceptible of being operated, primarily, by a foot motion rather than a hand motion as heretofore usual, although this new ump may be operated by the combined orces imparted by both foot and hand.

The invention consists in an air-pump comprising a vertical cylinder having a conduit for compressed air leading therefrom, and havin its movable piston rod, extendin above t e upper end of the cylinder, provi ed with a fixed transversely extended member, a rod connected to and depending below said member and provided with a oke to be engaged, and to be raised and owered, by the foot, and means for holdin by the hand, the cylinder stationary, whi e the iston is being foot-operated.

T e improved pump in its preferred con: struction comprises duplicated cylinders having conduits for delivering com ressed air leading from both cylinders joine into a single common connection together with a member connected with and transversely extending between both of the iston rods above the 11 per ends of the cy inders, and carrying r0 s depending below said members which support the foot engagement yoke which is shdably engaged at 0 posite ends thereof with the sides of the cy inders; and, moreover, the device to be grasped by one hand of the operator while the pump is being operated, for holding the cylinder stationary, is made vertically adjustable to conduce to the convenience of persons of different heights or habits.

The improved pump is illustrated in the accompanying drawings in which Figure 1 is a plan view; Fi 2 is a front elevation with one of the cylin ers shown in central vertical section; Fig. 3 is a cross sectional view in detail as taken on line 3-3,

Fig. 2. a

will now proceed to describe the air pump in detail and as I have constructed the same.

In the drawings,--A A represent duplicated axially vertical and parallel pump cylinders supported by and connected with a base B, both having pistons C (one thereof bein shown at the left of Fig. 2) and piston rods D D, the piston and valve arrangements for each cylinder being of any approved kind and generally such as usual in the most ordinary description of air pump.

From the lower end of each cylinder a conduit a leads, the two conduits being brought together and connected with a single flexible connection a? which is equipped with a couplin device a" whereby the air delivery con duits may be connected with the valve stem appurtenant to the pneumatic tire of the automobile or with an other desired appliance. The reciprocating piston rods D D extend above the upper ends of the cylinders, and a bar-like member E extends between and is connected with both of the piston rods. This bar-like member E has rods 1) b connected thereto and depending therebelow along the inner sides of the cylinders and carries, disposed between and connected with lower end portions thereof, a yoke G comprising separated upper and lower members d, (P, the upper member D being arched, and the yoke as a whole being designed to receive engagement therewithin of the foot of the operator whereby by a foot and leg m0- tion he may raise and lower the yoke and with it the frame comprising the parts b b and E, and the therewith connected piston rods D D. The opposite end portions of the lower member (1 of the yoke G are curved with concavities 6 corresponding to the peripheries of the cylinders, and these soformed end ortions have guiding engagements' with tile cylinders.

One or preferably a pair of metallic straps H H encircle one of the cylinders near its upper end, each stra havin a looped portion. and two metaFlic bloc s g are pro vide at either side of the neck of the loop; and a thumb screw it has its shank passed loosely through one of the blocks and through the strap at t e neck of the loop and with a screw-thread en agement into the other block; and a co paratively long rod J,- having a handle a at its upper end,1s engaged through the strap loop and may be confined in its adjustment at any deslred height by loosening the thumb screws, sliding the rod upward or downward and again tightening the screws. v

In operation a person first grasping the handle 2' of the rod J, which at the time of use is to all intents and purposes a rigid fixture of the pump body, engages the toe portion or body of the foot into the yoke G and bya leg motion alternately raises and returns to the lowered position the yoke, rods 6 b, transverse connecting member E and piston rods and pistons for the air compresslng' and delivering operation. For the convenience of some persons, and in order that they may stand erect and operate the ump without stooping, the rod J may be ad uSted so that its handle 71 is at .or about waist height and above the top of the cylinders, which commonly are about knee heights, butv where a maximum force is to be exerted in pumping, the handle is lowered nearly down to the level of the top of the cylinders, and the operator in addition to raising and lowering the yoke frame G, b b, E, by employment of the foot also augments the ower by the hand which grasps and upwardly draws and downwardly forces, throu h the medium of the transverse member I claim 1. In an air-pump, avertical cylinder having a connection for compressed air leading therefrom, and having its movable piston rod, extending above the upper end of the cylinder, provided with an afiixed trans, versely extended member, a rod connected to and depending below said member and provided with a yoke comprising separated upper and lower portions to be' engaged, andto be raised and lowered, by the upper and sole portions of a persons foot, and a part connected with the cylinder and adapted to be held by the hand for holding the cylinder stationary while the piston rod is being foot operated.

2. In an air-pump, a vertical cylinder havmg a connection for compressed air leading therefrom, and having 1ts piston rod, ex tending above the upper end of the cylinder,

' provided with an afiixed transversely exon the cylinder, a rod, vertically a tended member, a rod connected to and depending below said member and provided with a yoketo be engaged, and to be raised and lowered, by the foot, and slidabl guided d justable relatively to the pump, and means for detachably confining it at a desired hei ht, and a handle at the upper end of said ro 3. In an air-pump, a pair of separated vertical cylinders having conduits for delivmanta compressedair leading therefrom, and having their reciprocating iston rods extending above the upper en s of the cylinders, a member connected with and transversely extending between the piston rods above the cylin ers having rods connected thereto and depending below said member along the sides of the cylinders, a yoke to be engaged, and to be raised and lowered, by the foot, extending between and connected to lower portions of said rods, and a art connected with one of the c linders and adapted to be held by the hand fbr holding the cylinders stationary while the du licated piston rods are being foot operated through said 0 e. y 4:. In an air-pump,.a pair of separated ertical cylinders having conduits for delivering compressed air leading therefrom,and

a single conduit with which'both the first named conduits are connected, and said cylinders having their reciprocating piston rods extending above the upper fiends of the cylinders, versely extending between the piston rods above the cylinders, having rods connected thereto. and depending belowsaid member along the inner sides of the cylinders, a yoke comprising separated upper and lower members to be engaged by t e top and bottom of a foot of the operator, and to be raised and lowered, by such foot, extending between and connected to lower portions of said rods, and having guiding engagements with the cylinders, one or more metallic straps enclrclin one of the cylinders and each having a looped portion and a screw threaded device for constricting the loop and a rod having a handle at its upper end engaged throu h such stra loops ada ted to be adjusted and secure at variab e heights fpr the purpose set forth.

In an air-pump, a pair of separated vertical cylinders having conduits for delivering compressed airleading therefrom, and a single conduit with which both the first name conduits are connected, and said cylinders having their reciprocatin piston rods extending above the upper en s of the.

cylinders, a member connected with and transversely extending between the piston rods above the cylinders, having rods connected thereto and depending below said member along the inner sides of-the cylinders, a yoke comprising separated upper and lower members to be engaged by the top and bottom of a foot of the operator and to be raised and lowered, by such foot, extending between and connected to lower portions of said rods, and having guiding engagements with the cylinder, a metallic strap encircling one of the cylinders and having a looped portion, apair of metallic blocks at either side of the neck of the loop, a thumb-screw a member connected with and transhaving its shank passed loosely through one Signed by me at S ringfield, Mass, in 05 tile blocls an}? this1r strgp at the neck of presence of two subscri ing witnesses. teooean wit at ea enaementinto the oth er block, and a rod,ha'i%g a handle I SVEN D AHLBERG' 5 at its upper end,-engaged through the stra Witnesess:

100p, and to be confined at any desire GUSTAF N. TEGNELL, height, for the purpose explained. WM. S. BELLOWS. 

